Finite temperature QCD can be used to describe properties of a quark-gluon plasma (QGP) possibly created in the fireball of relativistic heavy ion collisions and in the early Universe. There are two different methods available, namely lattice QCD and perturbation theory. Lattice QCD is a non-perturbative method, which can be used at all temperatures above and below the phase transition. However...

Motivated by the quark-gluon plasma, we develop a simulation method to obtain spectral function of (Wilson) fermions non-perturbatively in non-Abelian gauge theory with large gluon occupation numbers [arXiv:2106.11319]. We apply our plasma close its non-thermal fixed point, i.e., far-from-equilibrium self-similar regime, and find mostly very good agreement perturbative hard loop (HTL) calculati...

While it is commonly believed that there is a direct transition from the hadronic to a quark gluon phase at high temperature, it would be prejudicial to rule out a sequence of dynamically generated intermediate scales. Using as guide, an effective lagrangian with unconfined gluons and constituent quarks, interacting with a chiral multiplet, we examine a scenario in which the system undergoes fi...

We investigate the energy loss of quark and gluon jets in quark-gluon plasma produced in central Au+Au collisions at RHIC energy. We use the physical characteristic of initial and mixed phases, which were found in effective quasiparticle model for SPS and RHIC energy [5]. At investigation of energy loss we take into account also the production of hot glue at first stage. The energy loss in expa...

We investigate the production of gluon pairs from a space-time dependent classical chromofield via vacuum polarization within the framework of the background field method of QCD. The investigation of the production of gluon pairs is important in the study of the evolution of the quark-gluon plasma in ultra-relativistic heavy-ion collisions at RHIC and LHC.

It is argued that strong dynamics in the quark-gluon plasma and bound states of quarks and gluons is mostly due to nonperturbative effects described by field correlators. The emphasis in the paper is made on two explicit calculations of these effects from the first principles – one analytic using gluelump Green’s functions and another using independent lattice data on correlators. The resulting...

We recalculate the free energy of droplets of quark-gluon plasma in a bulk hadronic medium, and of hadronic bubbles in a bulk quark-gluon plasma, under conditions resembling the cosmological quark-hadron transition. The results are derived using MIT bag boundary conditions, numerically summing over quark and gluon energy levels, as well as in terms of surface tension plus curvature expansions o...

We calculate the screening potential of a fast parton moving through a quark-gluon plasma in the framework of semi-classical transport theory. We found an anisotropic potential showing a minimum in the direction of the parton velocity. Possible consequences of this potential on binary states in a quark-gluon plasma are discussed. Screening of charges in a plasma is an important collective effec...